Breaking Capacity — What the Voltage-Specific Ratings Mean for Selectivity
The 3VA1112-3EF32-0AH0: Breaking capacity is stated per voltage level, not as a single number. At 240 V the MCCB interrupts 75.6 kA; at 415 V it handles 52.5 kA; at 440 V it drops to 32 kA; at 690 V it still clears 10.5 kA. For a site electrical engineer working on coordination studies, the 415 V figure is the one that governs most European 400 V distribution — 52.5 kA gives solid headroom above typical 25 kA or 36 kA panel SCCR targets. The 690 V rating matters for industrial grids with 660–690 V motor drives; 10.5 kA is adequate for most downstream sub-distribution but not for high-fault utility tie points.
Panel Fit and Mounting — 70 mm Depth, 76.2 mm Width
The MCCB measures 70 mm deep, 76.2 mm wide, and 130 mm tall. That 70 mm depth is shallow enough to fit most 200 mm deep enclosures with room for rear busbars or wiring ducts. The 76.2 mm width is a standard 3-pole MCCB footprint — it drops into a panel cutout or DIN-rail adapter without surprises. IP40 on the front means the operator face is protected against tools and wires larger than 1 mm; the back and sides rely on the enclosure for IP rating.
Built-In Auxiliary Contacts — 2 Aux + 1 Trip Alarm
This variant ships with 2 auxiliary switches and 1 trip alarm switch HQ — no separate add-on block needed for basic status feedback. The auxiliary contacts signal the open/closed position; the trip alarm switch changes state only when the breaker trips on fault, giving a dedicated remote alarm signal. That saves a DIN slot and wiring time compared to a bare MCCB that requires a separate auxiliary module.